Neil Roberts 8039c2c779 Fix a warning when building the SDL2 winsys
The SDL2 winsys was using _cogl_set_error without including its header
so it was giving an annoying warning. This patch also fixes some
indentation issues.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit 9c8433087b7573f7606dfae2bae3045803ead115)
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